The core of this may be something new to OP. Back in 2001 with IDE (PATA) drives predominant, it was still common for the BIOS to ASSUME that the boot drive C: was the Master device on the Primary IDE port, although it probably had a place in BIOS where that could be changed. Now, however, systems so commonly have more than one HDD, and often both PATA and SATA controllers / ports. So it is important that OP go into the BIOS Setup screens and specifically set which HDD unit will be used to boot from. This is NOT the same as getting the BIOS to detect the HDD in the first place. (Oh, by the way, there are times also in BIOS when you MUST be sure that the ports you have connected your HDD to (in this case, SATA) are actually Enabled.)...